How flower blight disease causes damage in carnation?

This fungal disease appears as tan to light brown soft rots on the petals of flower buds and opened flowers. Affected petals soon become covered with the greyish growth of the fungus filaments, which later are covered by a powdery mass of greyish spores. The disease usually occurs when the environment is cool and damp at night, and warm with high relative humidity in the daytime.